- Companies
- Property developers
- London
- Windowbuild Limited
Windowbuild Limited
- Company number
- 10666187
- Incorporated
- 13 Mar 20179 years trading
- Registered office
- 146 Rowan Road, London, SW16 5JQ
- Nature of business
- Development of building projects
Windowbuild Limited is a 9-year-old private limited company registered in London, company number 10666187, one of 14,100 property development companies in London. Its next accounts are due at Companies House on 31 January 2027, and the CT600 for the period to 30 April 2026 is due at HMRC on 30 April 2027.
Key dates
Worked out from the year end and filing history on the Companies House register.
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Finances
From each year's balance sheet filed at Companies House. Small companies do not have to publish turnover or profit, so these are balance sheet figures.
- Net assets down £16K (-34.1%) on the year before, to £31K.
- Net assets rose in 4 of 7 year-on-year comparisons on record.
- No employees reported for the latest year (directors are often not counted as employees).
- Balance sheets on record for 8 years, 2018 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 30 Apr 2025 | £31K | £54K | £17K | 0 | |
| 31 Mar 2024 | £47K | £0 | £2,850 | £56K | 1 |
| 31 Mar 2023 | £47K | £7,128 | £7,128 | £60K | 1 |
| 31 Mar 2022 | £30K | £2,703 | £2,703 | £55K | 1 |
| 31 Mar 2021 | £18K | £3,621 | £49K | 1 | |
| 31 Mar 2020 | £21K | £19K | |||
| 31 Mar 2019 | £1,146 | £0 | £0 | £480 | |
| 31 Mar 2018 | -£2,739 | £4,539 | £4,539 | £14K |
Where Windowbuild Limited is registered
The registered office is in London (SW16), in the Merton local authority area, London. Show SW16 5JQ on a map.
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What happens if Windowbuild Limited files late
Companies House charges an automatic penalty the day after the deadline, and it rises the longer the accounts are late. These are the dates for this company's accounts due on 31 January 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Feb 2027 to 28 Feb 2027 | £150 |
| 1 to 3 months late | 1 Mar 2027 to 30 Apr 2027 | £375 |
| 3 to 6 months late | 1 May 2027 to 31 Jul 2027 | £750 |
| More than 6 months late | From 1 Aug 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 May 2027 | £200 |
| 3 months late | 30 Jul 2027 | another £200 |
| 6 months late | 30 Oct 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Apr 2028 | another 10% of any unpaid tax |
For returns filed on or after 1 April 2026. Late three times in a row and the £200 penalties become £1,000 each.
Company details
As held on the Companies House register.
- Company number
- 10666187
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 13 March 2017 (9 years ago)
- Registered office
- 146 Rowan Road, London, SW16 5JQ
- Nature of business
- Development of building projects (SIC 41100)
- Year end
- 30 April (accounting reference date)
- Accounts type
- Unaudited abridged
- Last accounts made up to
- 30 April 2025
- Last confirmation statement
- 12 March 2026
Filing notes for property development companies
Many property development companies are single-project vehicles. Stock of land and buildings sits on the balance sheet as work in progress until sale, and a company that has finished its project may become dormant rather than close.
Similar companies in London
Other active property development companies registered in London.
- Windsong Ltd2023
- Windward Estates Limited1986
- Wingate Developments Limited1988
- Wingate Properties Limited1990
- Wingmatic Limited1987
- Wingssteel Project Ltd2021
- Winifred and Leonard Property Co. Ltd2026
- Winmax London Ltd2022
All property development companies in London · All trades in London · Property developers across the UK
Frequently asked questions
When are Windowbuild Limited's accounts due?
Windowbuild Limited's next accounts are due at Companies House by 31 January 2027 (in 111 days), covering the period to 30 April 2026.
When is Windowbuild Limited's CT600 due?
The CT600 for the period to 30 April 2026 is due at HMRC by 30 April 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 February 2027.
Is Windowbuild Limited still trading?
Windowbuild Limited is listed as active on the Companies House register as of 1 Oct 2026. Active means it has not been dissolved or entered insolvency; it does not show whether it is currently taking on work.
What does Windowbuild Limited do?
Windowbuild Limited is registered under Development of building projects (SIC 41100).
How old is Windowbuild Limited?
Windowbuild Limited was incorporated on 13 March 2017, 9 years ago.
What is the penalty if Windowbuild Limited files its accounts late?
Companies House charges £150 if the accounts are up to 1 month late, £375 up to 3 months, £750 up to 6 months and £1,500 after that, doubled if the previous year's accounts were also late. HMRC charges £200 for a CT600 filed a day late and another £200 at 3 months.
Official records
View Windowbuild Limited on Companies House for filed documents, officers and the full history.
Based on the Companies House register (snapshot 1 Oct 2026). Deadlines are worked out from the register and assume a standard accounting period; a change of year end or a short period moves them. This page is general information, not tax or accountancy advice.